using System;
using System.Reflection;

/*
 * Regression tests for the mono JIT.
 *
 * Each test needs to be of the form:
 *
 * public static int test_<result>_<name> ();
 *
 * where <result> is an integer (the value that needs to be returned by
 * the method to make it pass.
 * <name> is a user-displayed name used to identify the test.
 *
 * The tests can be driven in two ways:
 * *) running the program directly: Main() uses reflection to find and invoke
 * 	the test methods (this is useful mostly to check that the tests are correct)
 * *) with the --regression switch of the jit (this is the preferred way since
 * 	all the tests will be run with optimizations on and off)
 *
 * The reflection logic could be moved to a .dll since we need at least another
 * regression test file written in IL code to have better control on how
 * the IL code looks.
 */

public partial class Tests
{


    public static int test_0_sin_precision()
    {
        double d1 = Math.Sin(1);
        double d2 = Math.Sin(1) - d1;
        return (d2 == 0) ? 0 : 1;
    }

    public static int test_0_cos_precision()
    {
        double d1 = Math.Cos(1);
        double d2 = Math.Cos(1) - d1;
        return (d2 == 0) ? 0 : 1;
    }

    public static int test_0_tan_precision()
    {
        double d1 = Math.Tan(1);
        double d2 = Math.Tan(1) - d1;
        return (d2 == 0) ? 0 : 1;
    }

    public static int test_0_atan_precision()
    {
        double d1 = Math.Atan(double.NegativeInfinity);
        double d2 = Math.Atan(double.NegativeInfinity) - d1;
        return (d2 == 0) ? 0 : 1;
    }

    public static int test_0_sqrt_precision()
    {
        double d1 = Math.Sqrt(2);
        double d2 = Math.Sqrt(2) - d1;
        return (d2 == 0) ? 0 : 1;
    }

    public static int test_2_sqrt()
    {
        return (int)Math.Sqrt(4);
    }
    public static int test_0_sqrt_precision_and_not_spill()
    {
        double expected = 0;
        double[] operands = new double[3];
        double[] temporaries = new double[3];
        for (int i = 0; i < 3; i++)
        {
            operands[i] = (i + 1) * (i + 1) * (i + 1);
            if (i == 0)
            {
                expected = operands[0];
            }
            else
            {
                temporaries[i] = operands[i] / expected;
                temporaries[i] = Math.Sqrt(temporaries[i]);
                expected = temporaries[i];
            }

            //Console.Write( "{0}: {1}\n", i, temporaries [i] );
        }
        expected = temporaries[2];

        double result = Math.Sqrt(operands[2] / Math.Sqrt(operands[1] / operands[0]));

        //Console.Write( "result: {0,20:G}\n", result );

        return (result == expected) ? 0 : 1;
    }

    public static int test_0_sqrt_precision_and_spill()
    {
        double expected = 0;
        double[] operands = new double[9];
        double[] temporaries = new double[9];
        for (int i = 0; i < 9; i++)
        {
            operands[i] = (i + 1) * (i + 1) * (i + 1);
            if (i == 0)
            {
                expected = operands[0];
            }
            else
            {
                temporaries[i] = operands[i] / expected;
                temporaries[i] = Math.Sqrt(temporaries[i]);
                expected = temporaries[i];
            }

            //Console.Write( "{0}: {1}\n", i, temporaries [i] );
        }
        expected = temporaries[8];

        double result = Math.Sqrt(operands[8] / Math.Sqrt(operands[7] / Math.Sqrt(operands[6] / Math.Sqrt(operands[5] / Math.Sqrt(operands[4] / Math.Sqrt(operands[3] / Math.Sqrt(operands[2] / Math.Sqrt(operands[1] / operands[0]))))))));

        //Console.Write( "result: {0,20:G}\n", result );

        return (result == expected) ? 0 : 1;
    }

    public static int test_0_div_precision_and_spill()
    {
        double expected = 0;
        double[] operands = new double[9];
        double[] temporaries = new double[9];
        for (int i = 0; i < 9; i++)
        {
            operands[i] = (i + 1) * (i + 1);
            if (i == 0)
            {
                expected = operands[0];
            }
            else
            {
                temporaries[i] = operands[i] / expected;
                expected = temporaries[i];
            }

            //Console.Write( "{0}: {1}\n", i, temporaries [i] );
        }
        expected = temporaries[8];

        double result = (operands[8] / (operands[7] / (operands[6] / (operands[5] / (operands[4] / (operands[3] / (operands[2] / (operands[1] / operands[0]))))))));

        //Console.Write( "result: {0,20:G}\n", result );

        return (result == expected) ? 0 : 1;
    }

    public static int test_0_sqrt_nan()
    {
        return Double.IsNaN(Math.Sqrt(Double.NaN)) ? 0 : 1;
    }

    public static int test_0_sin_nan()
    {
        return Double.IsNaN(Math.Sin(Double.NaN)) ? 0 : 1;
    }

    public static int test_0_cos_nan()
    {
        return Double.IsNaN(Math.Cos(Double.NaN)) ? 0 : 1;
    }

    public static int test_0_tan_nan()
    {
        return Double.IsNaN(Math.Tan(Double.NaN)) ? 0 : 1;
    }

    public static int test_0_atan_nan()
    {
        return Double.IsNaN(Math.Atan(Double.NaN)) ? 0 : 1;
    }

    public static int test_0_min()
    {
        if (Math.Min(5, 6) != 5)
            return 1;
        if (Math.Min(6, 5) != 5)
            return 2;
        if (Math.Min(-100, -101) != -101)
            return 3;
        if (Math.Min((long)5, (long)6) != 5)
            return 4;
        if (Math.Min((long)6, (long)5) != 5)
            return 5;
        if (Math.Min((long)-100, (long)-101) != -101)
            return 6;
        return 0;
    }

    public static int test_0_max()
    {
        if (Math.Max(5, 6) != 6)
            return 1;
        if (Math.Max(6, 5) != 6)
            return 2;
        if (Math.Max(-100, -101) != -100)
            return 3;
        if (Math.Max((long)5, (long)6) != 6)
            return 4;
        if (Math.Max((long)6, (long)5) != 6)
            return 5;
        if (Math.Max((long)-100, (long)-101) != -100)
            return 6;
        return 0;
    }

    public static int test_0_min_un()
    {
        uint a = (uint)int.MaxValue + 10;

        for (uint b = 7; b <= 10; ++b)
        {
            if (Math.Min(a, b) != b)
                return (int)b;
            if (Math.Min(b, a) != b)
                return (int)b;
        }

        if (Math.Min((ulong)5, (ulong)6) != 5)
            return 4;
        if (Math.Min((ulong)6, (ulong)5) != 5)
            return 5;

        ulong la = (ulong)long.MaxValue + 10;

        for (ulong b = 7; b <= 10; ++b)
        {
            if (Math.Min(la, b) != b)
                return (int)b;
            if (Math.Min(b, la) != b)
                return (int)b;
        }

        return 0;
    }

    public static int test_0_max_un()
    {
        uint a = (uint)int.MaxValue + 10;

        for (uint b = 7; b <= 10; ++b)
        {
            if (Math.Max(a, b) != a)
                return (int)b;
            if (Math.Max(b, a) != a)
                return (int)b;
        }

        if (Math.Max((ulong)5, (ulong)6) != 6)
            return 4;
        if (Math.Max((ulong)6, (ulong)5) != 6)
            return 5;

        ulong la = (ulong)long.MaxValue + 10;

        for (ulong b = 7; b <= 10; ++b)
        {
            if (Math.Max(la, b) != la)
                return (int)b;
            if (Math.Max(b, la) != la)
                return (int)b;
        }

        return 0;
    }

    public static int test_0_abs()
    {
        double d = -5.0;

        if (Math.Abs(d) != 5.0)
            return 1;
        return 0;
    }

    public static int test_0_round()
    {
        if (Math.Round(5.0) != 5.0)
            return 1;

        if (Math.Round(5.000000000000001) != 5.0)
            return 2;

        if (Math.Round(5.499999999999999) != 5.0)
            return 3;

        if (Math.Round(5.5) != 6.0)
            return 4;

        if (Math.Round(5.999999999999999) != 6.0)
            return 5;

        if (Math.Round(Double.Epsilon) != 0)
            return 6;

        if (!Double.IsNaN(Math.Round(Double.NaN)))
            return 7;

        if (!Double.IsPositiveInfinity(Math.Round(Double.PositiveInfinity)))
            return 8;

        if (!Double.IsNegativeInfinity(Math.Round(Double.NegativeInfinity)))
            return 9;

        if (Math.Round(Double.MinValue) != Double.MinValue)
            return 10;

        if (Math.Round(Double.MaxValue) != Double.MaxValue)
            return 11;

        return 0;
    }
}
